I have no unmodified T61's. But if i need to check BIOS for modification (without hardware tests) i use SLIC toolkit utility. Unmodded bios have slic v 2.0 (or no slick at all).Modded BIOS have slic v 2.1. Or more presisely LENOVOTP-7U.

]]>2018-05-24T12:59:36-05:002018-05-24T12:59:36-05:00https://forum.thinkpads.com/viewtopic.php?t=126262&p=818411#p818411Lenovo P51S with Ultradock. Two USB hard drives attached to the dock. Both set for "Quick Removal" in Device Manager.

DO I need to "safely remove" these drives before hot undocking and docking?

It sounds more and more like a blown BIOS.A previous owner might have wanted to remove the wifi-whitelist and failed...Assuming there's no password on the BIOS, replacing those chips is cheaper than a new mobo, but requires deft manipulations.Check with the seller first, or return it for a full refund.

I checked the BIOS flash chips and both seem to be intact. What would one do to test whether or not they're blown?

Surely, you could use the chip's manual, apply voltages, and measure outputs.

Edit: Did a bit of digging and found that RAM rank incompatibilities may exist. I've only been testing with rank 1 (1Rx8) RAM. Putting a broken rank 2 (2Rx8) module in got me 8 beeps. I'll be getting a package of 2Rx8 RAM tomorrow and will do tests.